Abstract
Highly ordered TiO<sub>2</sub> nanowire arrays were prepared on the surface of Functionalized Graphene sheets (FGSs) by solgel method using titanium isopropoxide monomer with acetic acid as the polycondensation agent in the green solvent, supercritical carbon dioxide (sc-CO<sub>2</sub>). Morphology of synthesized materials was studied by SEM and TEM. Optical properties of the nanocomposites studied by UV spectroscopy which showed high absorption in visible area as well as reduction in their band gap compared to TiO<sub>2</sub>. By high resolution XPS, chelating bidentate structure of TiO<sub>2</sub> with carboxylic group on the surface of graphene sheets can be confirmed. Improvement in the optical properties of the synthesized composites compared to TiO<sub>2</sub> alone was confirmed by photocurrent measurements.
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